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ddf67f7135
The device tree overlays are a good way to deal with user-modifyable boards or boards with some kind of an expansion mechanism where we can easily plug new board in (like the BBB, the Raspberry Pi or the CHIP). Add a new function to merge overlays with a base device tree. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
2092 lines
77 KiB
C
2092 lines
77 KiB
C
#ifndef _LIBFDT_H
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#define _LIBFDT_H
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/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*
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* libfdt is dual licensed: you can use it either under the terms of
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* the GPL, or the BSD license, at your option.
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*
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* a) This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* Alternatively,
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*
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* b) Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <libfdt_env.h>
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#include <fdt.h>
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#define FDT_FIRST_SUPPORTED_VERSION 0x10
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#define FDT_LAST_SUPPORTED_VERSION 0x11
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/* Error codes: informative error codes */
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#define FDT_ERR_NOTFOUND 1
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/* FDT_ERR_NOTFOUND: The requested node or property does not exist */
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#define FDT_ERR_EXISTS 2
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/* FDT_ERR_EXISTS: Attemped to create a node or property which
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* already exists */
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#define FDT_ERR_NOSPACE 3
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/* FDT_ERR_NOSPACE: Operation needed to expand the device
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* tree, but its buffer did not have sufficient space to
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* contain the expanded tree. Use fdt_open_into() to move the
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* device tree to a buffer with more space. */
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/* Error codes: codes for bad parameters */
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#define FDT_ERR_BADOFFSET 4
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/* FDT_ERR_BADOFFSET: Function was passed a structure block
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* offset which is out-of-bounds, or which points to an
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* unsuitable part of the structure for the operation. */
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#define FDT_ERR_BADPATH 5
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/* FDT_ERR_BADPATH: Function was passed a badly formatted path
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* (e.g. missing a leading / for a function which requires an
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* absolute path) */
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#define FDT_ERR_BADPHANDLE 6
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/* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle
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* value. phandle values of 0 and -1 are not permitted. */
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#define FDT_ERR_BADSTATE 7
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/* FDT_ERR_BADSTATE: Function was passed an incomplete device
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* tree created by the sequential-write functions, which is
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* not sufficiently complete for the requested operation. */
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/* Error codes: codes for bad device tree blobs */
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#define FDT_ERR_TRUNCATED 8
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/* FDT_ERR_TRUNCATED: Structure block of the given device tree
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* ends without an FDT_END tag. */
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#define FDT_ERR_BADMAGIC 9
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/* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
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* device tree at all - it is missing the flattened device
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* tree magic number. */
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#define FDT_ERR_BADVERSION 10
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/* FDT_ERR_BADVERSION: Given device tree has a version which
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* can't be handled by the requested operation. For
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* read-write functions, this may mean that fdt_open_into() is
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* required to convert the tree to the expected version. */
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#define FDT_ERR_BADSTRUCTURE 11
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/* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
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* structure block or other serious error (e.g. misnested
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* nodes, or subnodes preceding properties). */
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#define FDT_ERR_BADLAYOUT 12
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/* FDT_ERR_BADLAYOUT: For read-write functions, the given
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* device tree has it's sub-blocks in an order that the
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* function can't handle (memory reserve map, then structure,
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* then strings). Use fdt_open_into() to reorganize the tree
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* into a form suitable for the read-write operations. */
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/* "Can't happen" error indicating a bug in libfdt */
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#define FDT_ERR_INTERNAL 13
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/* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
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* Should never be returned, if it is, it indicates a bug in
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* libfdt itself. */
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/* Errors in device tree content */
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#define FDT_ERR_BADNCELLS 14
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/* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells
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* or similar property with a bad format or value */
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#define FDT_ERR_TOODEEP 15
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/* FDT_ERR_TOODEEP: The depth of a node has exceeded the internal
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* libfdt limit. This can happen if you have more than
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* FDT_MAX_DEPTH nested nodes. */
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#define FDT_ERR_MAX 15
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/**********************************************************************/
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/* Low-level functions (you probably don't need these) */
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/**********************************************************************/
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const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
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static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
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{
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return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
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}
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uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
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/**********************************************************************/
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/* Traversal functions */
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/**********************************************************************/
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int fdt_next_node(const void *fdt, int offset, int *depth);
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/**
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* fdt_first_subnode() - get offset of first direct subnode
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*
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* @fdt: FDT blob
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* @offset: Offset of node to check
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* @return offset of first subnode, or -FDT_ERR_NOTFOUND if there is none
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*/
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int fdt_first_subnode(const void *fdt, int offset);
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/**
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* fdt_next_subnode() - get offset of next direct subnode
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*
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* After first calling fdt_first_subnode(), call this function repeatedly to
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* get direct subnodes of a parent node.
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*
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* @fdt: FDT blob
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* @offset: Offset of previous subnode
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* @return offset of next subnode, or -FDT_ERR_NOTFOUND if there are no more
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* subnodes
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*/
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int fdt_next_subnode(const void *fdt, int offset);
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/**
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* fdt_for_each_subnode - iterate over all subnodes of a parent
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*
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* This is actually a wrapper around a for loop and would be used like so:
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*
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* fdt_for_each_subnode(fdt, node, parent) {
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* ...
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* use node
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* ...
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* }
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*
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* Note that this is implemented as a macro and node is used as iterator in
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* the loop. It should therefore be a locally allocated variable. The parent
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* variable on the other hand is never modified, so it can be constant or
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* even a literal.
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*
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* @fdt: FDT blob (const void *)
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* @node: child node (int)
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* @parent: parent node (int)
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*/
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#define fdt_for_each_subnode(fdt, node, parent) \
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for (node = fdt_first_subnode(fdt, parent); \
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node >= 0; \
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node = fdt_next_subnode(fdt, node))
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/**********************************************************************/
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/* General functions */
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/**********************************************************************/
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#define fdt_get_header(fdt, field) \
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(fdt32_to_cpu(((const struct fdt_header *)(fdt))->field))
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#define fdt_magic(fdt) (fdt_get_header(fdt, magic))
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#define fdt_totalsize(fdt) (fdt_get_header(fdt, totalsize))
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#define fdt_off_dt_struct(fdt) (fdt_get_header(fdt, off_dt_struct))
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#define fdt_off_dt_strings(fdt) (fdt_get_header(fdt, off_dt_strings))
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#define fdt_off_mem_rsvmap(fdt) (fdt_get_header(fdt, off_mem_rsvmap))
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#define fdt_version(fdt) (fdt_get_header(fdt, version))
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#define fdt_last_comp_version(fdt) (fdt_get_header(fdt, last_comp_version))
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#define fdt_boot_cpuid_phys(fdt) (fdt_get_header(fdt, boot_cpuid_phys))
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#define fdt_size_dt_strings(fdt) (fdt_get_header(fdt, size_dt_strings))
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#define fdt_size_dt_struct(fdt) (fdt_get_header(fdt, size_dt_struct))
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#define __fdt_set_hdr(name) \
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static inline void fdt_set_##name(void *fdt, uint32_t val) \
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{ \
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struct fdt_header *fdth = (struct fdt_header*)fdt; \
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fdth->name = cpu_to_fdt32(val); \
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}
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__fdt_set_hdr(magic);
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__fdt_set_hdr(totalsize);
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__fdt_set_hdr(off_dt_struct);
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__fdt_set_hdr(off_dt_strings);
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__fdt_set_hdr(off_mem_rsvmap);
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__fdt_set_hdr(version);
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__fdt_set_hdr(last_comp_version);
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__fdt_set_hdr(boot_cpuid_phys);
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__fdt_set_hdr(size_dt_strings);
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__fdt_set_hdr(size_dt_struct);
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#undef __fdt_set_hdr
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/**
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* fdt_check_header - sanity check a device tree or possible device tree
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* @fdt: pointer to data which might be a flattened device tree
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*
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* fdt_check_header() checks that the given buffer contains what
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* appears to be a flattened device tree with sane information in its
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* header.
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*
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* returns:
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* 0, if the buffer appears to contain a valid device tree
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings, as above
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*/
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int fdt_check_header(const void *fdt);
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/**
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* fdt_move - move a device tree around in memory
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* @fdt: pointer to the device tree to move
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* @buf: pointer to memory where the device is to be moved
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* @bufsize: size of the memory space at buf
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*
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* fdt_move() relocates, if possible, the device tree blob located at
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* fdt to the buffer at buf of size bufsize. The buffer may overlap
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* with the existing device tree blob at fdt. Therefore,
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* fdt_move(fdt, fdt, fdt_totalsize(fdt))
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* should always succeed.
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*
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* returns:
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* 0, on success
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* -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings
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*/
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int fdt_move(const void *fdt, void *buf, int bufsize);
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/**********************************************************************/
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/* Read-only functions */
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/**********************************************************************/
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/**
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* fdt_string - retrieve a string from the strings block of a device tree
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* @fdt: pointer to the device tree blob
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* @stroffset: offset of the string within the strings block (native endian)
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*
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* fdt_string() retrieves a pointer to a single string from the
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* strings block of the device tree blob at fdt.
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*
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* returns:
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* a pointer to the string, on success
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* NULL, if stroffset is out of bounds
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*/
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const char *fdt_string(const void *fdt, int stroffset);
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/**
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* fdt_get_max_phandle - retrieves the highest phandle in a tree
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* @fdt: pointer to the device tree blob
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*
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* fdt_get_max_phandle retrieves the highest phandle in the given
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* device tree
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*
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* returns:
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* the highest phandle on success
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* 0, if an error occurred
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*/
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uint32_t fdt_get_max_phandle(const void *fdt);
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/**
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* fdt_num_mem_rsv - retrieve the number of memory reserve map entries
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* @fdt: pointer to the device tree blob
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*
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* Returns the number of entries in the device tree blob's memory
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* reservation map. This does not include the terminating 0,0 entry
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* or any other (0,0) entries reserved for expansion.
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*
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* returns:
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* the number of entries
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*/
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int fdt_num_mem_rsv(const void *fdt);
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/**
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* fdt_get_mem_rsv - retrieve one memory reserve map entry
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* @fdt: pointer to the device tree blob
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* @address, @size: pointers to 64-bit variables
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*
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* On success, *address and *size will contain the address and size of
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* the n-th reserve map entry from the device tree blob, in
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* native-endian format.
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*
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* returns:
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* 0, on success
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings
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*/
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int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
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/**
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* fdt_subnode_offset_namelen - find a subnode based on substring
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* @fdt: pointer to the device tree blob
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* @parentoffset: structure block offset of a node
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* @name: name of the subnode to locate
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* @namelen: number of characters of name to consider
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*
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* Identical to fdt_subnode_offset(), but only examine the first
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* namelen characters of name for matching the subnode name. This is
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* useful for finding subnodes based on a portion of a larger string,
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* such as a full path.
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*/
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int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
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const char *name, int namelen);
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/**
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* fdt_subnode_offset - find a subnode of a given node
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* @fdt: pointer to the device tree blob
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* @parentoffset: structure block offset of a node
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* @name: name of the subnode to locate
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*
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* fdt_subnode_offset() finds a subnode of the node at structure block
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* offset parentoffset with the given name. name may include a unit
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* address, in which case fdt_subnode_offset() will find the subnode
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* with that unit address, or the unit address may be omitted, in
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* which case fdt_subnode_offset() will find an arbitrary subnode
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* whose name excluding unit address matches the given name.
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*
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* returns:
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* structure block offset of the requested subnode (>=0), on success
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* -FDT_ERR_NOTFOUND, if the requested subnode does not exist
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* -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE,
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* -FDT_ERR_BADSTRUCTURE,
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* -FDT_ERR_TRUNCATED, standard meanings.
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*/
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int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
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/**
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* fdt_path_offset_namelen - find a tree node based on substring
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* @fdt: pointer to the device tree blob
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* @path: full path of the node to locate
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* @namelen: number of characters of name to consider
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*
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* Identical to fdt_path_offset(), but only examine the first
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* namelen characters of path for matching the node path.
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*/
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int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen);
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/**
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* fdt_path_offset - find a tree node by its full path
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* @fdt: pointer to the device tree blob
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* @path: full path of the node to locate
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*
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* fdt_path_offset() finds a node of a given path in the device tree.
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* Each path component may omit the unit address portion, but the
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* results of this are undefined if any such path component is
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* ambiguous (that is if there are multiple nodes at the relevant
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* level matching the given component, differentiated only by unit
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* address).
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*
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* returns:
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* structure block offset of the node with the requested path (>=0), on success
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* -FDT_ERR_BADPATH, given path does not begin with '/' or is invalid
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* -FDT_ERR_NOTFOUND, if the requested node does not exist
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE,
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* -FDT_ERR_BADSTRUCTURE,
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* -FDT_ERR_TRUNCATED, standard meanings.
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*/
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static inline int fdt_path_offset(const void *fdt, const char *path)
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{
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return fdt_path_offset_namelen(fdt, path, strlen(path));
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}
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/**
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* fdt_get_name - retrieve the name of a given node
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* @fdt: pointer to the device tree blob
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* @nodeoffset: structure block offset of the starting node
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* @lenp: pointer to an integer variable (will be overwritten) or NULL
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*
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* fdt_get_name() retrieves the name (including unit address) of the
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* device tree node at structure block offset nodeoffset. If lenp is
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* non-NULL, the length of this name is also returned, in the integer
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* pointed to by lenp.
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*
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* returns:
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* pointer to the node's name, on success
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* If lenp is non-NULL, *lenp contains the length of that name (>=0)
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* NULL, on error
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* if lenp is non-NULL *lenp contains an error code (<0):
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* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
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* -FDT_ERR_BADMAGIC,
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* -FDT_ERR_BADVERSION,
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* -FDT_ERR_BADSTATE, standard meanings
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*/
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const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
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/**
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* fdt_first_property_offset - find the offset of a node's first property
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* @fdt: pointer to the device tree blob
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* @nodeoffset: structure block offset of a node
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*
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* fdt_first_property_offset() finds the first property of the node at
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* the given structure block offset.
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*
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* returns:
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* structure block offset of the property (>=0), on success
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* -FDT_ERR_NOTFOUND, if the requested node has no properties
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* -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag
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* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_first_property_offset(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_next_property_offset - step through a node's properties
|
|
* @fdt: pointer to the device tree blob
|
|
* @offset: structure block offset of a property
|
|
*
|
|
* fdt_next_property_offset() finds the property immediately after the
|
|
* one at the given structure block offset. This will be a property
|
|
* of the same node as the given property.
|
|
*
|
|
* returns:
|
|
* structure block offset of the next property (>=0), on success
|
|
* -FDT_ERR_NOTFOUND, if the given property is the last in its node
|
|
* -FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_next_property_offset(const void *fdt, int offset);
|
|
|
|
/**
|
|
* fdt_for_each_property - iterate over all properties of a node
|
|
* @property_offset: property offset (int)
|
|
* @fdt: FDT blob (const void *)
|
|
* @node: node offset (int)
|
|
*
|
|
* This is actually a wrapper around a for loop and would be used like so:
|
|
*
|
|
* fdt_for_each_property(fdt, node, property) {
|
|
* ...
|
|
* use property
|
|
* ...
|
|
* }
|
|
*
|
|
* Note that this is implemented as a macro and property is used as
|
|
* iterator in the loop. It should therefore be a locally allocated
|
|
* variable. The node variable on the other hand is never modified, so
|
|
* it can be constant or even a literal.
|
|
*/
|
|
#define fdt_for_each_property_offset(property, fdt, node) \
|
|
for (property = fdt_first_property_offset(fdt, node); \
|
|
property >= 0; \
|
|
property = fdt_next_property_offset(fdt, property))
|
|
|
|
/**
|
|
* fdt_get_property_by_offset - retrieve the property at a given offset
|
|
* @fdt: pointer to the device tree blob
|
|
* @offset: offset of the property to retrieve
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_get_property_by_offset() retrieves a pointer to the
|
|
* fdt_property structure within the device tree blob at the given
|
|
* offset. If lenp is non-NULL, the length of the property value is
|
|
* also returned, in the integer pointed to by lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the structure representing the property
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
|
|
int offset,
|
|
int *lenp);
|
|
|
|
/**
|
|
* fdt_get_property_namelen - find a property based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @namelen: number of characters of name to consider
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* Identical to fdt_get_property_namelen(), but only examine the first
|
|
* namelen characters of name for matching the property name.
|
|
*/
|
|
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
|
|
int nodeoffset,
|
|
const char *name,
|
|
int namelen, int *lenp);
|
|
|
|
/**
|
|
* fdt_get_property - find a given property in a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_get_property() retrieves a pointer to the fdt_property
|
|
* structure within the device tree blob corresponding to the property
|
|
* named 'name' of the node at offset nodeoffset. If lenp is
|
|
* non-NULL, the length of the property value is also returned, in the
|
|
* integer pointed to by lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the structure representing the property
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_NOTFOUND, node does not have named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
|
|
const char *name, int *lenp);
|
|
static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
|
|
const char *name,
|
|
int *lenp)
|
|
{
|
|
return (struct fdt_property *)(uintptr_t)
|
|
fdt_get_property(fdt, nodeoffset, name, lenp);
|
|
}
|
|
|
|
/**
|
|
* fdt_getprop_by_offset - retrieve the value of a property at a given offset
|
|
* @fdt: pointer to the device tree blob
|
|
* @ffset: offset of the property to read
|
|
* @namep: pointer to a string variable (will be overwritten) or NULL
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_getprop_by_offset() retrieves a pointer to the value of the
|
|
* property at structure block offset 'offset' (this will be a pointer
|
|
* to within the device blob itself, not a copy of the value). If
|
|
* lenp is non-NULL, the length of the property value is also
|
|
* returned, in the integer pointed to by lenp. If namep is non-NULL,
|
|
* the property's namne will also be returned in the char * pointed to
|
|
* by namep (this will be a pointer to within the device tree's string
|
|
* block, not a new copy of the name).
|
|
*
|
|
* returns:
|
|
* pointer to the property's value
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* if namep is non-NULL *namep contiains a pointer to the property
|
|
* name.
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const void *fdt_getprop_by_offset(const void *fdt, int offset,
|
|
const char **namep, int *lenp);
|
|
|
|
/**
|
|
* fdt_getprop_namelen - get property value based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @namelen: number of characters of name to consider
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* Identical to fdt_getprop(), but only examine the first namelen
|
|
* characters of name for matching the property name.
|
|
*/
|
|
const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
|
|
const char *name, int namelen, int *lenp);
|
|
static inline void *fdt_getprop_namelen_w(void *fdt, int nodeoffset,
|
|
const char *name, int namelen,
|
|
int *lenp)
|
|
{
|
|
return (void *)(uintptr_t)fdt_getprop_namelen(fdt, nodeoffset, name,
|
|
namelen, lenp);
|
|
}
|
|
|
|
/**
|
|
* fdt_getprop - retrieve the value of a given property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to find
|
|
* @name: name of the property to find
|
|
* @lenp: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_getprop() retrieves a pointer to the value of the property
|
|
* named 'name' of the node at offset nodeoffset (this will be a
|
|
* pointer to within the device blob itself, not a copy of the value).
|
|
* If lenp is non-NULL, the length of the property value is also
|
|
* returned, in the integer pointed to by lenp.
|
|
*
|
|
* returns:
|
|
* pointer to the property's value
|
|
* if lenp is non-NULL, *lenp contains the length of the property
|
|
* value (>=0)
|
|
* NULL, on error
|
|
* if lenp is non-NULL, *lenp contains an error code (<0):
|
|
* -FDT_ERR_NOTFOUND, node does not have named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
const void *fdt_getprop(const void *fdt, int nodeoffset,
|
|
const char *name, int *lenp);
|
|
static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
|
|
const char *name, int *lenp)
|
|
{
|
|
return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);
|
|
}
|
|
|
|
/**
|
|
* fdt_get_phandle - retrieve the phandle of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of the node
|
|
*
|
|
* fdt_get_phandle() retrieves the phandle of the device tree node at
|
|
* structure block offset nodeoffset.
|
|
*
|
|
* returns:
|
|
* the phandle of the node at nodeoffset, on success (!= 0, != -1)
|
|
* 0, if the node has no phandle, or another error occurs
|
|
*/
|
|
uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_get_alias_namelen - get alias based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of the alias th look up
|
|
* @namelen: number of characters of name to consider
|
|
*
|
|
* Identical to fdt_get_alias(), but only examine the first namelen
|
|
* characters of name for matching the alias name.
|
|
*/
|
|
const char *fdt_get_alias_namelen(const void *fdt,
|
|
const char *name, int namelen);
|
|
|
|
/**
|
|
* fdt_get_alias - retreive the path referenced by a given alias
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of the alias th look up
|
|
*
|
|
* fdt_get_alias() retrieves the value of a given alias. That is, the
|
|
* value of the property named 'name' in the node /aliases.
|
|
*
|
|
* returns:
|
|
* a pointer to the expansion of the alias named 'name', if it exists
|
|
* NULL, if the given alias or the /aliases node does not exist
|
|
*/
|
|
const char *fdt_get_alias(const void *fdt, const char *name);
|
|
|
|
/**
|
|
* fdt_get_path - determine the full path of a node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose path to find
|
|
* @buf: character buffer to contain the returned path (will be overwritten)
|
|
* @buflen: size of the character buffer at buf
|
|
*
|
|
* fdt_get_path() computes the full path of the node at offset
|
|
* nodeoffset, and records that path in the buffer at buf.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* buf contains the absolute path of the node at
|
|
* nodeoffset, as a NUL-terminated string.
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)
|
|
* characters and will not fit in the given buffer.
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
|
|
|
|
/**
|
|
* fdt_supernode_atdepth_offset - find a specific ancestor of a node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
* @supernodedepth: depth of the ancestor to find
|
|
* @nodedepth: pointer to an integer variable (will be overwritten) or NULL
|
|
*
|
|
* fdt_supernode_atdepth_offset() finds an ancestor of the given node
|
|
* at a specific depth from the root (where the root itself has depth
|
|
* 0, its immediate subnodes depth 1 and so forth). So
|
|
* fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);
|
|
* will always return 0, the offset of the root node. If the node at
|
|
* nodeoffset has depth D, then:
|
|
* fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);
|
|
* will return nodeoffset itself.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
|
|
* structure block offset of the node at node offset's ancestor
|
|
* of depth supernodedepth (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
|
|
int supernodedepth, int *nodedepth);
|
|
|
|
/**
|
|
* fdt_node_depth - find the depth of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
*
|
|
* fdt_node_depth() finds the depth of a given node. The root node
|
|
* has depth 0, its immediate subnodes depth 1 and so forth.
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset.
|
|
*
|
|
* returns:
|
|
* depth of the node at nodeoffset (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_depth(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_parent_offset - find the parent of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose parent to find
|
|
*
|
|
* fdt_parent_offset() locates the parent node of a given node (that
|
|
* is, it finds the offset of the node which contains the node at
|
|
* nodeoffset as a subnode).
|
|
*
|
|
* NOTE: This function is expensive, as it must scan the device tree
|
|
* structure from the start to nodeoffset, *twice*.
|
|
*
|
|
* returns:
|
|
* structure block offset of the parent of the node at nodeoffset
|
|
* (>=0), on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_parent_offset(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_node_offset_by_prop_value - find nodes with a given property value
|
|
* @fdt: pointer to the device tree blob
|
|
* @startoffset: only find nodes after this offset
|
|
* @propname: property name to check
|
|
* @propval: property value to search for
|
|
* @proplen: length of the value in propval
|
|
*
|
|
* fdt_node_offset_by_prop_value() returns the offset of the first
|
|
* node after startoffset, which has a property named propname whose
|
|
* value is of length proplen and has value equal to propval; or if
|
|
* startoffset is -1, the very first such node in the tree.
|
|
*
|
|
* To iterate through all nodes matching the criterion, the following
|
|
* idiom can be used:
|
|
* offset = fdt_node_offset_by_prop_value(fdt, -1, propname,
|
|
* propval, proplen);
|
|
* while (offset != -FDT_ERR_NOTFOUND) {
|
|
* // other code here
|
|
* offset = fdt_node_offset_by_prop_value(fdt, offset, propname,
|
|
* propval, proplen);
|
|
* }
|
|
*
|
|
* Note the -1 in the first call to the function, if 0 is used here
|
|
* instead, the function will never locate the root node, even if it
|
|
* matches the criterion.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0, >startoffset),
|
|
* on success
|
|
* -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
|
|
* tree after startoffset
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
|
|
const char *propname,
|
|
const void *propval, int proplen);
|
|
|
|
/**
|
|
* fdt_node_offset_by_phandle - find the node with a given phandle
|
|
* @fdt: pointer to the device tree blob
|
|
* @phandle: phandle value
|
|
*
|
|
* fdt_node_offset_by_phandle() returns the offset of the node
|
|
* which has the given phandle value. If there is more than one node
|
|
* in the tree with the given phandle (an invalid tree), results are
|
|
* undefined.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0), on success
|
|
* -FDT_ERR_NOTFOUND, no node with that phandle exists
|
|
* -FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1)
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle);
|
|
|
|
/**
|
|
* fdt_node_check_compatible: check a node's compatible property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of a tree node
|
|
* @compatible: string to match against
|
|
*
|
|
*
|
|
* fdt_node_check_compatible() returns 0 if the given node contains a
|
|
* 'compatible' property with the given string as one of its elements,
|
|
* it returns non-zero otherwise, or on error.
|
|
*
|
|
* returns:
|
|
* 0, if the node has a 'compatible' property listing the given string
|
|
* 1, if the node has a 'compatible' property, but it does not list
|
|
* the given string
|
|
* -FDT_ERR_NOTFOUND, if the given node has no 'compatible' property
|
|
* -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
|
|
const char *compatible);
|
|
|
|
/**
|
|
* fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
|
|
* @fdt: pointer to the device tree blob
|
|
* @startoffset: only find nodes after this offset
|
|
* @compatible: 'compatible' string to match against
|
|
*
|
|
* fdt_node_offset_by_compatible() returns the offset of the first
|
|
* node after startoffset, which has a 'compatible' property which
|
|
* lists the given compatible string; or if startoffset is -1, the
|
|
* very first such node in the tree.
|
|
*
|
|
* To iterate through all nodes matching the criterion, the following
|
|
* idiom can be used:
|
|
* offset = fdt_node_offset_by_compatible(fdt, -1, compatible);
|
|
* while (offset != -FDT_ERR_NOTFOUND) {
|
|
* // other code here
|
|
* offset = fdt_node_offset_by_compatible(fdt, offset, compatible);
|
|
* }
|
|
*
|
|
* Note the -1 in the first call to the function, if 0 is used here
|
|
* instead, the function will never locate the root node, even if it
|
|
* matches the criterion.
|
|
*
|
|
* returns:
|
|
* structure block offset of the located node (>= 0, >startoffset),
|
|
* on success
|
|
* -FDT_ERR_NOTFOUND, no node matching the criterion exists in the
|
|
* tree after startoffset
|
|
* -FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE, standard meanings
|
|
*/
|
|
int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
|
|
const char *compatible);
|
|
|
|
/**
|
|
* fdt_stringlist_contains - check a string list property for a string
|
|
* @strlist: Property containing a list of strings to check
|
|
* @listlen: Length of property
|
|
* @str: String to search for
|
|
*
|
|
* This is a utility function provided for convenience. The list contains
|
|
* one or more strings, each terminated by \0, as is found in a device tree
|
|
* "compatible" property.
|
|
*
|
|
* @return: 1 if the string is found in the list, 0 not found, or invalid list
|
|
*/
|
|
int fdt_stringlist_contains(const char *strlist, int listlen, const char *str);
|
|
|
|
/**
|
|
* fdt_count_strings - count the number of strings in a string list
|
|
* @fdt: pointer to the device tree blob
|
|
* @node: offset of the node
|
|
* @property: name of the property containing the string list
|
|
* @return: the number of strings in the given property
|
|
*/
|
|
int fdt_count_strings(const void *fdt, int node, const char *property);
|
|
|
|
/**
|
|
* fdt_find_string - find a string in a string list and return its index
|
|
* @fdt: pointer to the device tree blob
|
|
* @node: offset of the node
|
|
* @property: name of the property containing the string list
|
|
* @string: string to look up in the string list
|
|
* @return: the index of the string or negative on error
|
|
*/
|
|
int fdt_find_string(const void *fdt, int node, const char *property,
|
|
const char *string);
|
|
|
|
/**
|
|
* fdt_get_string_index() - obtain the string at a given index in a string list
|
|
* @fdt: pointer to the device tree blob
|
|
* @node: offset of the node
|
|
* @property: name of the property containing the string list
|
|
* @index: index of the string to return
|
|
* @output: return location for the string
|
|
* @return: 0 if the string was found or a negative error code otherwise
|
|
*/
|
|
int fdt_get_string_index(const void *fdt, int node, const char *property,
|
|
int index, const char **output);
|
|
|
|
/**
|
|
* fdt_get_string() - obtain the first string in a string list
|
|
* @fdt: pointer to the device tree blob
|
|
* @node: offset of the node
|
|
* @property: name of the property containing the string list
|
|
* @output: return location for the string
|
|
* @return: 0 if the string was found or a negative error code otherwise
|
|
*
|
|
* This is a shortcut for:
|
|
*
|
|
* fdt_get_string_index(fdt, node, property, 0, output).
|
|
*/
|
|
int fdt_get_string(const void *fdt, int node, const char *property,
|
|
const char **output);
|
|
|
|
/**********************************************************************/
|
|
/* Read-only functions (addressing related) */
|
|
/**********************************************************************/
|
|
|
|
/**
|
|
* FDT_MAX_NCELLS - maximum value for #address-cells and #size-cells
|
|
*
|
|
* This is the maximum value for #address-cells, #size-cells and
|
|
* similar properties that will be processed by libfdt. IEE1275
|
|
* requires that OF implementations handle values up to 4.
|
|
* Implementations may support larger values, but in practice higher
|
|
* values aren't used.
|
|
*/
|
|
#define FDT_MAX_NCELLS 4
|
|
|
|
/**
|
|
* fdt_address_cells - retrieve address size for a bus represented in the tree
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to find the address size for
|
|
*
|
|
* When the node has a valid #address-cells property, returns its value.
|
|
*
|
|
* returns:
|
|
* 0 <= n < FDT_MAX_NCELLS, on success
|
|
* 2, if the node has no #address-cells property
|
|
* -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
|
|
* #address-cells property
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_address_cells(const void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_size_cells - retrieve address range size for a bus represented in the
|
|
* tree
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to find the address range size for
|
|
*
|
|
* When the node has a valid #size-cells property, returns its value.
|
|
*
|
|
* returns:
|
|
* 0 <= n < FDT_MAX_NCELLS, on success
|
|
* 2, if the node has no #address-cells property
|
|
* -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
|
|
* #size-cells property
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_size_cells(const void *fdt, int nodeoffset);
|
|
|
|
|
|
/**********************************************************************/
|
|
/* Write-in-place functions */
|
|
/**********************************************************************/
|
|
|
|
/**
|
|
* fdt_setprop_inplace_namelen_partial - change a property's value,
|
|
* but not its size
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @namelen: number of characters of name to consider
|
|
* @index: index of the property to change in the array
|
|
* @val: pointer to data to replace the property value with
|
|
* @len: length of the property value
|
|
*
|
|
* Identical to fdt_setprop_inplace(), but modifies the given property
|
|
* starting from the given index, and using only the first characters
|
|
* of the name. It is useful when you want to manipulate only one value of
|
|
* an array and you have a string that doesn't end with \0.
|
|
*/
|
|
int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
|
|
const char *name, int namelen,
|
|
uint32_t index, const void *val,
|
|
int len);
|
|
|
|
/**
|
|
* fdt_setprop_inplace - change a property's value, but not its size
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: pointer to data to replace the property value with
|
|
* @len: length of the property value
|
|
*
|
|
* fdt_setprop_inplace() replaces the value of a given property with
|
|
* the data in val, of length len. This function cannot change the
|
|
* size of a property, and so will only work if len is equal to the
|
|
* current length of the property.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if len is not equal to the property's current length
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
|
|
/**
|
|
* fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value to replace the property with
|
|
*
|
|
* fdt_setprop_inplace_u32() replaces the value of a given property
|
|
* with the 32-bit integer value in val, converting val to big-endian
|
|
* if necessary. This function cannot change the size of a property,
|
|
* and so will only work if the property already exists and has length
|
|
* 4.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if the property's length is not equal to 4
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_inplace_u64 - change the value of a 64-bit integer property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value to replace the property with
|
|
*
|
|
* fdt_setprop_inplace_u64() replaces the value of a given property
|
|
* with the 64-bit integer value in val, converting val to big-endian
|
|
* if necessary. This function cannot change the size of a property,
|
|
* and so will only work if the property already exists and has length
|
|
* 8.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the given property value, and will not alter or move any other part
|
|
* of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, if the property's length is not equal to 8
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset,
|
|
const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_inplace_cell - change the value of a single-cell property
|
|
*
|
|
* This is an alternative name for fdt_setprop_inplace_u32()
|
|
*/
|
|
static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_nop_property - replace a property with nop tags
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to nop
|
|
* @name: name of the property to nop
|
|
*
|
|
* fdt_nop_property() will replace a given property's representation
|
|
* in the blob with FDT_NOP tags, effectively removing it from the
|
|
* tree.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the property, and will not alter or move any other part of the
|
|
* tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_nop_property(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_nop_node - replace a node (subtree) with nop tags
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to nop
|
|
*
|
|
* fdt_nop_node() will replace a given node's representation in the
|
|
* blob, including all its subnodes, if any, with FDT_NOP tags,
|
|
* effectively removing it from the tree.
|
|
*
|
|
* This function will alter only the bytes in the blob which contain
|
|
* the node and its properties and subnodes, and will not alter or
|
|
* move any other part of the tree.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_nop_node(void *fdt, int nodeoffset);
|
|
|
|
/**********************************************************************/
|
|
/* Sequential write functions */
|
|
/**********************************************************************/
|
|
|
|
int fdt_create(void *buf, int bufsize);
|
|
int fdt_resize(void *fdt, void *buf, int bufsize);
|
|
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
|
|
int fdt_finish_reservemap(void *fdt);
|
|
int fdt_begin_node(void *fdt, const char *name);
|
|
int fdt_property(void *fdt, const char *name, const void *val, int len);
|
|
static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_property(fdt, name, &tmp, sizeof(tmp));
|
|
}
|
|
static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_property(fdt, name, &tmp, sizeof(tmp));
|
|
}
|
|
static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
|
|
{
|
|
return fdt_property_u32(fdt, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_property_placeholder - add a new property and return a ptr to its value
|
|
*
|
|
* @fdt: pointer to the device tree blob
|
|
* @name: name of property to add
|
|
* @len: length of property value in bytes
|
|
* @valp: returns a pointer to where where the value should be placed
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_NOSPACE, standard meanings
|
|
*/
|
|
int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp);
|
|
|
|
#define fdt_property_string(fdt, name, str) \
|
|
fdt_property(fdt, name, str, strlen(str)+1)
|
|
int fdt_end_node(void *fdt);
|
|
int fdt_finish(void *fdt);
|
|
|
|
/**********************************************************************/
|
|
/* Read-write functions */
|
|
/**********************************************************************/
|
|
|
|
int fdt_create_empty_tree(void *buf, int bufsize);
|
|
int fdt_open_into(const void *fdt, void *buf, int bufsize);
|
|
int fdt_pack(void *fdt);
|
|
|
|
/**
|
|
* fdt_add_mem_rsv - add one memory reserve map entry
|
|
* @fdt: pointer to the device tree blob
|
|
* @address, @size: 64-bit values (native endian)
|
|
*
|
|
* Adds a reserve map entry to the given blob reserving a region at
|
|
* address address of length size.
|
|
*
|
|
* This function will insert data into the reserve map and will
|
|
* therefore change the indexes of some entries in the table.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new reservation entry
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
|
|
|
|
/**
|
|
* fdt_del_mem_rsv - remove a memory reserve map entry
|
|
* @fdt: pointer to the device tree blob
|
|
* @n: entry to remove
|
|
*
|
|
* fdt_del_mem_rsv() removes the n-th memory reserve map entry from
|
|
* the blob.
|
|
*
|
|
* This function will delete data from the reservation table and will
|
|
* therefore change the indexes of some entries in the table.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
|
|
* are less than n+1 reserve map entries)
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_del_mem_rsv(void *fdt, int n);
|
|
|
|
/**
|
|
* fdt_set_name - change the name of a given node
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: structure block offset of a node
|
|
* @name: name to give the node
|
|
*
|
|
* fdt_set_name() replaces the name (including unit address, if any)
|
|
* of the given node with the given string. NOTE: this function can't
|
|
* efficiently check if the new name is unique amongst the given
|
|
* node's siblings; results are undefined if this function is invoked
|
|
* with a name equal to one of the given node's siblings.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob
|
|
* to contain the new name
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE, standard meanings
|
|
*/
|
|
int fdt_set_name(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_setprop - create or change a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: pointer to data to set the property value to
|
|
* @len: length of the property value
|
|
*
|
|
* fdt_setprop() sets the value of the named property in the given
|
|
* node to the given value and length, creating the property if it
|
|
* does not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
|
|
/**
|
|
* fdt_setprop_u32 - set a property to a 32-bit integer
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value for the property (native endian)
|
|
*
|
|
* fdt_setprop_u32() sets the value of the named property in the given
|
|
* node to the given 32-bit integer value (converting to big-endian if
|
|
* necessary), or creates a new property with that value if it does
|
|
* not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name,
|
|
uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_u64 - set a property to a 64-bit integer
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value for the property (native endian)
|
|
*
|
|
* fdt_setprop_u64() sets the value of the named property in the given
|
|
* node to the given 64-bit integer value (converting to big-endian if
|
|
* necessary), or creates a new property with that value if it does
|
|
* not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name,
|
|
uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_cell - set a property to a single cell value
|
|
*
|
|
* This is an alternative name for fdt_setprop_u32()
|
|
*/
|
|
static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
|
|
uint32_t val)
|
|
{
|
|
return fdt_setprop_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_setprop_string - set a property to a string value
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @str: string value for the property
|
|
*
|
|
* fdt_setprop_string() sets the value of the named property in the
|
|
* given node to the given string value (using the length of the
|
|
* string to determine the new length of the property), or creates a
|
|
* new property with that value if it does not already exist.
|
|
*
|
|
* This function may insert or delete data from the blob, and will
|
|
* therefore change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
|
|
fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
|
|
|
|
/**
|
|
* fdt_appendprop - append to or create a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to append to
|
|
* @val: pointer to data to append to the property value
|
|
* @len: length of the data to append to the property value
|
|
*
|
|
* fdt_appendprop() appends the value to the named property in the
|
|
* given node, creating the property if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
|
|
const void *val, int len);
|
|
|
|
/**
|
|
* fdt_appendprop_u32 - append a 32-bit integer value to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 32-bit integer value to append to the property (native endian)
|
|
*
|
|
* fdt_appendprop_u32() appends the given 32-bit integer value
|
|
* (converting to big-endian if necessary) to the value of the named
|
|
* property in the given node, or creates a new property with that
|
|
* value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_appendprop_u32(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
fdt32_t tmp = cpu_to_fdt32(val);
|
|
return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_u64 - append a 64-bit integer value to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @val: 64-bit integer value to append to the property (native endian)
|
|
*
|
|
* fdt_appendprop_u64() appends the given 64-bit integer value
|
|
* (converting to big-endian if necessary) to the value of the named
|
|
* property in the given node, or creates a new property with that
|
|
* value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
static inline int fdt_appendprop_u64(void *fdt, int nodeoffset,
|
|
const char *name, uint64_t val)
|
|
{
|
|
fdt64_t tmp = cpu_to_fdt64(val);
|
|
return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_cell - append a single cell value to a property
|
|
*
|
|
* This is an alternative name for fdt_appendprop_u32()
|
|
*/
|
|
static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
|
|
const char *name, uint32_t val)
|
|
{
|
|
return fdt_appendprop_u32(fdt, nodeoffset, name, val);
|
|
}
|
|
|
|
/**
|
|
* fdt_appendprop_string - append a string to a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to change
|
|
* @name: name of the property to change
|
|
* @str: string value to append to the property
|
|
*
|
|
* fdt_appendprop_string() appends the given string to the value of
|
|
* the named property in the given node, or creates a new property
|
|
* with that value if it does not already exist.
|
|
*
|
|
* This function may insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
|
|
* contain the new property value
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
#define fdt_appendprop_string(fdt, nodeoffset, name, str) \
|
|
fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
|
|
|
|
/**
|
|
* fdt_delprop - delete a property
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node whose property to nop
|
|
* @name: name of the property to nop
|
|
*
|
|
* fdt_del_property() will delete the given property.
|
|
*
|
|
* This function will delete data from the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOTFOUND, node does not have the named property
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_delprop(void *fdt, int nodeoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_add_subnode_namelen - creates a new node based on substring
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to locate
|
|
* @namelen: number of characters of name to consider
|
|
*
|
|
* Identical to fdt_add_subnode(), but use only the first namelen
|
|
* characters of name as the name of the new node. This is useful for
|
|
* creating subnodes based on a portion of a larger string, such as a
|
|
* full path.
|
|
*/
|
|
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
|
|
const char *name, int namelen);
|
|
|
|
/**
|
|
* fdt_add_subnode - creates a new node
|
|
* @fdt: pointer to the device tree blob
|
|
* @parentoffset: structure block offset of a node
|
|
* @name: name of the subnode to locate
|
|
*
|
|
* fdt_add_subnode() creates a new node as a subnode of the node at
|
|
* structure block offset parentoffset, with the given name (which
|
|
* should include the unit address, if any).
|
|
*
|
|
* This function will insert data into the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
|
|
* returns:
|
|
* structure block offset of the created nodeequested subnode (>=0), on success
|
|
* -FDT_ERR_NOTFOUND, if the requested subnode does not exist
|
|
* -FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
|
|
* the given name
|
|
* -FDT_ERR_NOSPACE, if there is insufficient free space in the
|
|
* blob to contain the new node
|
|
* -FDT_ERR_NOSPACE
|
|
* -FDT_ERR_BADLAYOUT
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings.
|
|
*/
|
|
int fdt_add_subnode(void *fdt, int parentoffset, const char *name);
|
|
|
|
/**
|
|
* fdt_del_node - delete a node (subtree)
|
|
* @fdt: pointer to the device tree blob
|
|
* @nodeoffset: offset of the node to nop
|
|
*
|
|
* fdt_del_node() will remove the given node, including all its
|
|
* subnodes if any, from the blob.
|
|
*
|
|
* This function will delete data from the blob, and will therefore
|
|
* change the offsets of some existing nodes.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_del_node(void *fdt, int nodeoffset);
|
|
|
|
/**
|
|
* fdt_overlay_apply - Applies a DT overlay on a base DT
|
|
* @fdt: pointer to the base device tree blob
|
|
* @fdto: pointer to the device tree overlay blob
|
|
*
|
|
* fdt_overlay_apply() will apply the given device tree overlay on the
|
|
* given base device tree.
|
|
*
|
|
* Expect the base device tree to be modified, even if the function
|
|
* returns an error.
|
|
*
|
|
* returns:
|
|
* 0, on success
|
|
* -FDT_ERR_NOSPACE, there's not enough space in the base device tree
|
|
* -FDT_ERR_NOTFOUND, the overlay points to some inexistant nodes or
|
|
* properties in the base DT
|
|
* -FDT_ERR_BADPHANDLE, the phandles in the overlay do not have the right
|
|
* magic
|
|
* -FDT_ERR_INTERNAL,
|
|
* -FDT_ERR_BADLAYOUT,
|
|
* -FDT_ERR_BADMAGIC,
|
|
* -FDT_ERR_BADOFFSET,
|
|
* -FDT_ERR_BADPATH,
|
|
* -FDT_ERR_BADVERSION,
|
|
* -FDT_ERR_BADSTRUCTURE,
|
|
* -FDT_ERR_BADSTATE,
|
|
* -FDT_ERR_TRUNCATED, standard meanings
|
|
*/
|
|
int fdt_overlay_apply(void *fdt, void *fdto);
|
|
|
|
/**********************************************************************/
|
|
/* Debugging / informational functions */
|
|
/**********************************************************************/
|
|
|
|
const char *fdt_strerror(int errval);
|
|
|
|
/**
|
|
* fdt_remove_unused_strings() - Remove any unused strings from an FDT
|
|
*
|
|
* This creates a new device tree in @new with unused strings removed. The
|
|
* called can then use fdt_pack() to minimise the space consumed.
|
|
*
|
|
* @old: Old device tree blog
|
|
* @new: Place to put new device tree blob, which must be as large as
|
|
* @old
|
|
* @return
|
|
* 0, on success
|
|
* -FDT_ERR_BADOFFSET, corrupt device tree
|
|
* -FDT_ERR_NOSPACE, out of space, which should not happen unless there
|
|
* is something very wrong with the device tree input
|
|
*/
|
|
int fdt_remove_unused_strings(const void *old, void *new);
|
|
|
|
struct fdt_region {
|
|
int offset;
|
|
int size;
|
|
};
|
|
|
|
/*
|
|
* Flags for fdt_find_regions()
|
|
*
|
|
* Add a region for the string table (always the last region)
|
|
*/
|
|
#define FDT_REG_ADD_STRING_TAB (1 << 0)
|
|
|
|
/*
|
|
* Add all supernodes of a matching node/property, useful for creating a
|
|
* valid subset tree
|
|
*/
|
|
#define FDT_REG_SUPERNODES (1 << 1)
|
|
|
|
/* Add the FDT_BEGIN_NODE tags of subnodes, including their names */
|
|
#define FDT_REG_DIRECT_SUBNODES (1 << 2)
|
|
|
|
/* Add all subnodes of a matching node */
|
|
#define FDT_REG_ALL_SUBNODES (1 << 3)
|
|
|
|
/* Add a region for the mem_rsvmap table (always the first region) */
|
|
#define FDT_REG_ADD_MEM_RSVMAP (1 << 4)
|
|
|
|
/* Indicates what an fdt part is (node, property, value) */
|
|
#define FDT_IS_NODE (1 << 0)
|
|
#define FDT_IS_PROP (1 << 1)
|
|
#define FDT_IS_VALUE (1 << 2) /* not supported */
|
|
#define FDT_IS_COMPAT (1 << 3) /* used internally */
|
|
#define FDT_NODE_HAS_PROP (1 << 4) /* node contains prop */
|
|
|
|
#define FDT_ANY_GLOBAL (FDT_IS_NODE | FDT_IS_PROP | FDT_IS_VALUE | \
|
|
FDT_IS_COMPAT)
|
|
#define FDT_IS_ANY 0x1f /* all the above */
|
|
|
|
/* We set a reasonable limit on the number of nested nodes */
|
|
#define FDT_MAX_DEPTH 32
|
|
|
|
/* Decribes what we want to include from the current tag */
|
|
enum want_t {
|
|
WANT_NOTHING,
|
|
WANT_NODES_ONLY, /* No properties */
|
|
WANT_NODES_AND_PROPS, /* Everything for one level */
|
|
WANT_ALL_NODES_AND_PROPS /* Everything for all levels */
|
|
};
|
|
|
|
/* Keeps track of the state at parent nodes */
|
|
struct fdt_subnode_stack {
|
|
int offset; /* Offset of node */
|
|
enum want_t want; /* The 'want' value here */
|
|
int included; /* 1 if we included this node, 0 if not */
|
|
};
|
|
|
|
struct fdt_region_ptrs {
|
|
int depth; /* Current tree depth */
|
|
int done; /* What we have completed scanning */
|
|
enum want_t want; /* What we are currently including */
|
|
char *end; /* Pointer to end of full node path */
|
|
int nextoffset; /* Next node offset to check */
|
|
};
|
|
|
|
/* The state of our finding algortihm */
|
|
struct fdt_region_state {
|
|
struct fdt_subnode_stack stack[FDT_MAX_DEPTH]; /* node stack */
|
|
struct fdt_region *region; /* Contains list of regions found */
|
|
int count; /* Numnber of regions found */
|
|
const void *fdt; /* FDT blob */
|
|
int max_regions; /* Maximum regions to find */
|
|
int can_merge; /* 1 if we can merge with previous region */
|
|
int start; /* Start position of current region */
|
|
struct fdt_region_ptrs ptrs; /* Pointers for what we are up to */
|
|
};
|
|
|
|
/**
|
|
* fdt_find_regions() - find regions in device tree
|
|
*
|
|
* Given a list of nodes to include and properties to exclude, find
|
|
* the regions of the device tree which describe those included parts.
|
|
*
|
|
* The intent is to get a list of regions which will be invariant provided
|
|
* those parts are invariant. For example, if you request a list of regions
|
|
* for all nodes but exclude the property "data", then you will get the
|
|
* same region contents regardless of any change to "data" properties.
|
|
*
|
|
* This function can be used to produce a byte-stream to send to a hashing
|
|
* function to verify that critical parts of the FDT have not changed.
|
|
*
|
|
* Nodes which are given in 'inc' are included in the region list, as
|
|
* are the names of the immediate subnodes nodes (but not the properties
|
|
* or subnodes of those subnodes).
|
|
*
|
|
* For eaxample "/" means to include the root node, all root properties
|
|
* and the FDT_BEGIN_NODE and FDT_END_NODE of all subnodes of /. The latter
|
|
* ensures that we capture the names of the subnodes. In a hashing situation
|
|
* it prevents the root node from changing at all Any change to non-excluded
|
|
* properties, names of subnodes or number of subnodes would be detected.
|
|
*
|
|
* When used with FITs this provides the ability to hash and sign parts of
|
|
* the FIT based on different configurations in the FIT. Then it is
|
|
* impossible to change anything about that configuration (include images
|
|
* attached to the configuration), but it may be possible to add new
|
|
* configurations, new images or new signatures within the existing
|
|
* framework.
|
|
*
|
|
* Adding new properties to a device tree may result in the string table
|
|
* being extended (if the new property names are different from those
|
|
* already added). This function can optionally include a region for
|
|
* the string table so that this can be part of the hash too.
|
|
*
|
|
* The device tree header is not included in the list.
|
|
*
|
|
* @fdt: Device tree to check
|
|
* @inc: List of node paths to included
|
|
* @inc_count: Number of node paths in list
|
|
* @exc_prop: List of properties names to exclude
|
|
* @exc_prop_count: Number of properties in exclude list
|
|
* @region: Returns list of regions
|
|
* @max_region: Maximum length of region list
|
|
* @path: Pointer to a temporary string for the function to use for
|
|
* building path names
|
|
* @path_len: Length of path, must be large enough to hold the longest
|
|
* path in the tree
|
|
* @add_string_tab: 1 to add a region for the string table
|
|
* @return number of regions in list. If this is >max_regions then the
|
|
* region array was exhausted. You should increase max_regions and try
|
|
* the call again.
|
|
*/
|
|
int fdt_find_regions(const void *fdt, char * const inc[], int inc_count,
|
|
char * const exc_prop[], int exc_prop_count,
|
|
struct fdt_region region[], int max_regions,
|
|
char *path, int path_len, int add_string_tab);
|
|
|
|
/**
|
|
* fdt_first_region() - find regions in device tree
|
|
*
|
|
* Given a nodes and properties to include and properties to exclude, find
|
|
* the regions of the device tree which describe those included parts.
|
|
*
|
|
* The use for this function is twofold. Firstly it provides a convenient
|
|
* way of performing a structure-aware grep of the tree. For example it is
|
|
* possible to grep for a node and get all the properties associated with
|
|
* that node. Trees can be subsetted easily, by specifying the nodes that
|
|
* are required, and then writing out the regions returned by this function.
|
|
* This is useful for small resource-constrained systems, such as boot
|
|
* loaders, which want to use an FDT but do not need to know about all of
|
|
* it.
|
|
*
|
|
* Secondly it makes it easy to hash parts of the tree and detect changes.
|
|
* The intent is to get a list of regions which will be invariant provided
|
|
* those parts are invariant. For example, if you request a list of regions
|
|
* for all nodes but exclude the property "data", then you will get the
|
|
* same region contents regardless of any change to "data" properties.
|
|
*
|
|
* This function can be used to produce a byte-stream to send to a hashing
|
|
* function to verify that critical parts of the FDT have not changed.
|
|
* Note that semantically null changes in order could still cause false
|
|
* hash misses. Such reordering might happen if the tree is regenerated
|
|
* from source, and nodes are reordered (the bytes-stream will be emitted
|
|
* in a different order and mnay hash functions will detect this). However
|
|
* if an existing tree is modified using libfdt functions, such as
|
|
* fdt_add_subnode() and fdt_setprop(), then this problem is avoided.
|
|
*
|
|
* The nodes/properties to include/exclude are defined by a function
|
|
* provided by the caller. This function is called for each node and
|
|
* property, and must return:
|
|
*
|
|
* 0 - to exclude this part
|
|
* 1 - to include this part
|
|
* -1 - for FDT_IS_PROP only: no information is available, so include
|
|
* if its containing node is included
|
|
*
|
|
* The last case is only used to deal with properties. Often a property is
|
|
* included if its containing node is included - this is the case where
|
|
* -1 is returned.. However if the property is specifically required to be
|
|
* included/excluded, then 0 or 1 can be returned. Note that including a
|
|
* property when the FDT_REG_SUPERNODES flag is given will force its
|
|
* containing node to be included since it is not valid to have a property
|
|
* that is not in a node.
|
|
*
|
|
* Using the information provided, the inclusion of a node can be controlled
|
|
* either by a node name or its compatible string, or any other property
|
|
* that the function can determine.
|
|
*
|
|
* As an example, including node "/" means to include the root node and all
|
|
* root properties. A flag provides a way of also including supernodes (of
|
|
* which there is none for the root node), and another flag includes
|
|
* immediate subnodes, so in this case we would get the FDT_BEGIN_NODE and
|
|
* FDT_END_NODE of all subnodes of /.
|
|
*
|
|
* The subnode feature helps in a hashing situation since it prevents the
|
|
* root node from changing at all. Any change to non-excluded properties,
|
|
* names of subnodes or number of subnodes would be detected.
|
|
*
|
|
* When used with FITs this provides the ability to hash and sign parts of
|
|
* the FIT based on different configurations in the FIT. Then it is
|
|
* impossible to change anything about that configuration (include images
|
|
* attached to the configuration), but it may be possible to add new
|
|
* configurations, new images or new signatures within the existing
|
|
* framework.
|
|
*
|
|
* Adding new properties to a device tree may result in the string table
|
|
* being extended (if the new property names are different from those
|
|
* already added). This function can optionally include a region for
|
|
* the string table so that this can be part of the hash too. This is always
|
|
* the last region.
|
|
*
|
|
* The FDT also has a mem_rsvmap table which can also be included, and is
|
|
* always the first region if so.
|
|
*
|
|
* The device tree header is not included in the region list. Since the
|
|
* contents of the FDT are changing (shrinking, often), the caller will need
|
|
* to regenerate the header anyway.
|
|
*
|
|
* @fdt: Device tree to check
|
|
* @h_include: Function to call to determine whether to include a part or
|
|
* not:
|
|
*
|
|
* @priv: Private pointer as passed to fdt_find_regions()
|
|
* @fdt: Pointer to FDT blob
|
|
* @offset: Offset of this node / property
|
|
* @type: Type of this part, FDT_IS_...
|
|
* @data: Pointer to data (node name, property name, compatible
|
|
* string, value (not yet supported)
|
|
* @size: Size of data, or 0 if none
|
|
* @return 0 to exclude, 1 to include, -1 if no information is
|
|
* available
|
|
* @priv: Private pointer passed to h_include
|
|
* @region: Returns list of regions, sorted by offset
|
|
* @max_regions: Maximum length of region list
|
|
* @path: Pointer to a temporary string for the function to use for
|
|
* building path names
|
|
* @path_len: Length of path, must be large enough to hold the longest
|
|
* path in the tree
|
|
* @flags: Various flags that control the region algortihm, see
|
|
* FDT_REG_...
|
|
* @return number of regions in list. If this is >max_regions then the
|
|
* region array was exhausted. You should increase max_regions and try
|
|
* the call again. Only the first max_regions elements are available in the
|
|
* array.
|
|
*
|
|
* On error a -ve value is return, which can be:
|
|
*
|
|
* -FDT_ERR_BADSTRUCTURE (too deep or more END tags than BEGIN tags
|
|
* -FDT_ERR_BADLAYOUT
|
|
* -FDT_ERR_NOSPACE (path area is too small)
|
|
*/
|
|
int fdt_first_region(const void *fdt,
|
|
int (*h_include)(void *priv, const void *fdt, int offset,
|
|
int type, const char *data, int size),
|
|
void *priv, struct fdt_region *region,
|
|
char *path, int path_len, int flags,
|
|
struct fdt_region_state *info);
|
|
|
|
/** fdt_next_region() - find next region
|
|
*
|
|
* See fdt_first_region() for full description. This function finds the
|
|
* next region according to the provided parameters, which must be the same
|
|
* as passed to fdt_first_region().
|
|
*
|
|
* This function can additionally return -FDT_ERR_NOTFOUND when there are no
|
|
* more regions
|
|
*/
|
|
int fdt_next_region(const void *fdt,
|
|
int (*h_include)(void *priv, const void *fdt, int offset,
|
|
int type, const char *data, int size),
|
|
void *priv, struct fdt_region *region,
|
|
char *path, int path_len, int flags,
|
|
struct fdt_region_state *info);
|
|
|
|
/**
|
|
* fdt_add_alias_regions() - find aliases that point to existing regions
|
|
*
|
|
* Once a device tree grep is complete some of the nodes will be present
|
|
* and some will have been dropped. This function checks all the alias nodes
|
|
* to figure out which points point to nodes which are still present. These
|
|
* aliases need to be kept, along with the nodes they reference.
|
|
*
|
|
* Given a list of regions function finds the aliases that still apply and
|
|
* adds more regions to the list for these. This function is called after
|
|
* fdt_next_region() has finished returning regions and requires the same
|
|
* state.
|
|
*
|
|
* @fdt: Device tree file to reference
|
|
* @region: List of regions that will be kept
|
|
* @count: Number of regions
|
|
* @max_regions: Number of entries that can fit in @region
|
|
* @info: Region state as returned from fdt_next_region()
|
|
* @return new number of regions in @region (i.e. count + the number added)
|
|
* or -FDT_ERR_NOSPACE if there was not enough space.
|
|
*/
|
|
int fdt_add_alias_regions(const void *fdt, struct fdt_region *region, int count,
|
|
int max_regions, struct fdt_region_state *info);
|
|
|
|
#endif /* _LIBFDT_H */
|